interface SpeakHello {
    void speak();
}
class HelloMachine {
    public void turnOn(SpeakHello hello) {
        hello.speak();
    }
}
public class Example7_3 {
    public static void main(String args[]) {
        HelloMachine machine = new HelloMachine();
        machine.turnOn( new SpeakHello() {
                        public void speak(){
                            System.out.println("hello,you are welcome!");
                      }
                }
        );
        machine.turnOn( new SpeakHello() {
                        public void speak(){
                            System.out.println("你好，欢迎光临!");
                      }
                }
        );
    }
}
